Scotland Yard is probing claims that he was abused after being outed as gay against his will

“I was punched, Tasered, beaten and raped. The worst of this abuse was perpetrated by the prison guards and police,” he wrote in the Independent.

“I lost a lot of weight through stress. Once, when I asked for some painkillers, a guard hit me over the head with a broom handle.

“You cannot imagine how that constant threat of abuse makes you feel. All around you people are being raped, and abused – you get these young kids who come in and get raped.”

He added: “The only way to describe being in prison in Dubai is hell. I was held for 22 months and I’ll never forget it – the stench, the dirt, the smell, the heat, and the lack of any information whatsoever.”

In his complaint to the Met Police, David says he suffered damage to his knee, hands, shoulder, eyes, teeth and a fractured cheek bone.

David said he was denied medication and only allowed to see his lawyers two minutes a week

He says he was forced to initiate legal action against them for breach of contract.

But after he flew to Dubai for a meeting to resolve outstanding issues, he was arrested and held on trumped-up fraud and embezzlement criminal charges.

David's claimed he was tortured in the same police station where Lee Bradley, a British holidaymaker, died in 2011 amid allegations he was beaten in custody.

Having been held since May 2014 and convicted of fraud he was due for release in November 2016, only to be re-arrested for slander over comments made on Twitter while he was in jail, which kept him behind bars for another five months.

David's case took six months and seven hearings before he was acquitted in March last year.

His lawyer, Toby Cadman, of Guernica 37 International Justice Chambers, told SunOnline they have notified the Met and the UN about the allegations.

He said: “Mr Haigh was detained on spurious allegations, was tortured during that detention, and has submitted a complaint to the Metropolitan Police with a request that they investigate.

“We have also submitted complaints to the UN Working Group on Arbitrary Detention and UN Special Rapporteur on Torture.”

Brit accused of indecency in Dubai Jamie Harron in video message of thanks to family and supporters

He said the Met Police have the mandate to investigate given that the allegations include acts of torture.

Charges could be made against named individuals, including those who carried out the acts of torture during his detention, and those that were aware of it, but took the decision to either ignore, or give their approval.

A Scotland Yard spokesman said: “We can confirm that in July 2017, we received an allegation of torture of a British national in Dubai, UAE between May 2014 and April 2016.

“Officers from the Met's War Crimes Unit (part of SO15) are currently scoping the allegations in line with the Crown Prosecution Service (CPS) and SO15 guidelines.”

If charges follow, anyone identified by David as carrying out the torture could be arrested if they set foot in the UK, put on trial and jailed for life if convicted.

He spoke out after fellow Brit Jamie Harron was detained in a Dubai jail for touching a man’s hip in a bar.